package com.wuhuahe.learning.lagou.cloud.gateway.filters;

import lombok.extern.slf4j.Slf4j;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.util.ArrayList;
import java.util.List;

@Slf4j
//@Component
public class BlacklistFilter implements GlobalFilter, Ordered {

    private List<String> blackList = new ArrayList<>();

    public BlacklistFilter(){
        blackList.add("0:0:0:0:0:0:0:1");
    }

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {

        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();

        String remoteIp = request.getRemoteAddress().getHostString();

        if(blackList.contains(remoteIp)){
            log.error("命中黑名单：{}", request);

            response.setStatusCode(HttpStatus.UNAUTHORIZED);


            DataBuffer wrap = response.bufferFactory().wrap("Requst be denied".getBytes());

            return response.writeWith(Mono.just(wrap));
        }


        return chain.filter(exchange);
    }

    @Override
    public int getOrder() {
        return 0;
    }
}
